Wear mechanisms of α-alumina lubricated with a paraffin oil

Deckman, Douglas E.; Jahanmir, Said; Hsu, Stephen M.

doi:10.1016/0043-1648(91)90370-a

Cited by 25 publications

(7 citation statements)

References 10 publications

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“…F igure 3 shows typical data obtained for a 99.5 per cent alumina [8], indicating abrupt increases in wear as the load reaches a critical value that depends on the sliding speed. Observation of the wear scars before and after this transitio n con®rmed that severe wear had occurred through a microfracture process simila r to the unlubricated tests.…”

Section: Aluminamentioning

confidence: 97%

Wear transitions and tribochemical reactions in ceramics

Jahanmir

2002

Proceedings of the Institution of Mechanical Engineers, Part J:

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Structu ral ceramics are used in diverse tribological applications due to their unique properties that include resistance to abrasio n and erosion, resistance to corrosive wear, wear resista nce at elevated temperatures, low density and unique electrical, thermal and magnetic properties. Applications include precision instrument bearings, cutting tool inserts, prosthetic articulating joints and engine components. F ollowing a brief overview of the processing methods applied to alumina, silicon nitrid e and silicon carbide, the wear behaviour of these ceramics is reviewed. The wear behaviour changes as the load or the coef®cient of frictio n is increased. This change is associated with a drastic increase in wear at a critical load that depends on the material and test conditions. This transition from mild to severe wear occurs through a microfracture process at the sliding contact. Contact mechanics is used to develop a simp le model to determine whether contact failure occurs by a classical brittle process (i.e. cone cracking) or a quasi-plastic behaviour (i.e. small microcracks distrib uted below the contact surface). The model provides estimates of the transition load within a factor of two of the experimentally obtained values and indicates that the brit tle behaviour dominates the observed transition from mild to severe wear in the three ceramics evaluated in this study. The limita tions of the model and its use in design of tribological components are discussed. The role of lubrication and tribochemical reactions between ceramic surfaces and atmospheric moisture on the wear behaviour is discussed.

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Section: Aluminamentioning

confidence: 97%

Wear transitions and tribochemical reactions in ceramics

Jahanmir

2002

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…However, a scarcity of synovial fluid lubricant in ceramic self-mating hip joints might create an extremely severe thermomechanical environment [ 60 ], in which modifications of the alumina lattice ( i.e ., especially in correspondence of grain boundaries) might increasingly take place. In this context, one could also hypothesize a role of protein by-products (e.g., hydrocarbons [ 61 ]) or body-released ions (e.g., Ca 2+ , Mg 2+ , and Na + ) on possible stoichiometric alterations of the alumina lattice. It is known, for example, that dilution of sodium hyaluronate (with release of Na + ions) takes place in patients affected by rheumatoid arthritis, as systematically detected by Dahl et al [ 62 ].…”

Section: Background On Physical Chemistry Of Bioceramicsmentioning

confidence: 99%

Bioceramics for Hip Joints: The Physical Chemistry Viewpoint

Pezzotti

2014

Materials

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Which intrinsic biomaterial parameter governs and, if quantitatively monitored, could reveal to us the actual lifetime potential of advanced hip joint bearing materials? An answer to this crucial question is searched for in this paper, which identifies ceramic bearings as the most innovative biomaterials in hip arthroplasty. It is shown that, if in vivo exposures comparable to human lifetimes are actually searched for, then fundamental issues should lie in the physical chemistry aspects of biomaterial surfaces. Besides searching for improvements in the phenomenological response of biomaterials to engineering protocols, hip joint components should also be designed to satisfy precise stability requirements in the stoichiometric behavior of their surfaces when exposed to extreme chemical and micromechanical conditions. New spectroscopic protocols have enabled us to visualize surface stoichiometry at the molecular scale, which is shown to be the key for assessing bioceramics with elongated lifetimes with respect to the primitive alumina biomaterials used in the past.

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“…It is also important to note that the friction coefficient of ceramics, unlike metals, is considerably reduced by pure hydrocarbon oils that do not contain surfactants [Jahanmir andFischer 1988, andDeckman et al 1991]. In a recent study [Gates and Hsu 1991], several chemical compounds were evaluated for their potential use as lubricant additives.…”

Section: Chemically Assisted Grindingmentioning

confidence: 99%

Ceramic machining

Jahanmir¹,

Ives²,

Ruff³

et al. 1992

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in 1988 by Congress to "assist industry in the development of technology. .. needed to improve product quality, to modernize manufacturing processes, to ensure product reliability. .. and to facilitate rapid commercialization ... of products based on new scientific discoveries." NIST, originally founded as the National Bureau of Standards in 1901, works to strengthen U.S. industry's competitiveness; advance science and engineering; and improve public health, safety, and the environment. One of the agency's basic functions is to develop, maintain, and retain custody of the national standards of measurement, and provide the means and methods for comparing standards used in science, engineering, manufacturing, commerce, industry, and education with the standards adopted or recognized by the Federal Government. 'At Boulder, CO 80303. 2 Some elements at Boulder, CO 80303.

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Wear mechanisms of α-alumina lubricated with a paraffin oil

Cited by 25 publications

References 10 publications

Wear transitions and tribochemical reactions in ceramics

Wear transitions and tribochemical reactions in ceramics

Bioceramics for Hip Joints: The Physical Chemistry Viewpoint

Ceramic machining

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